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negro is decidedly less susceptible to pain than the whites. The negro's skin is decidedly less susceptible to most forms of external irritation. A hot sun which may severely burn the white man will not affect the negro's skin. It is said to be very difficult to blister a true negro. Fox's statistics also show a lessened susceptibility to vegetabledoi:10.1056/nejm190806111582407 fatcat:ay6upwtycffbdpw72xslzw336e